Enable fake dark by default

app/src/main/java/eu/faircode/email/AdapterMessage.java

@@ -2517,6 +2517,7 @@ public class AdapterMessage extends RecyclerView.Adapter<AdapterMessage.ViewHold
             boolean show_images = properties.getValue("images", message.id);
             boolean show_quotes = (properties.getValue("quotes", message.id) || !collapse_quotes);
 
+            boolean dark = Helper.isDarkTheme(context);
             boolean force_light = properties.getValue("force_light", message.id);
             boolean always_images = prefs.getBoolean("html_always_images", false);
             if (always_images && show_full) {
@@ -2664,7 +2665,6 @@ public class AdapterMessage extends RecyclerView.Adapter<AdapterMessage.ViewHold
             float scale = (size == 0 || textSize == 0 ? 1.0f : size / (textSize * message_zoom / 100f));
             args.putFloat("scale", scale);
 
-            boolean dark = Helper.isDarkTheme(context);
             args.putBoolean("fake_dark", !canDarken && fake_dark && dark && !force_light);
 
             new SimpleTask<Object>() {
@@ -7120,7 +7120,7 @@ public class AdapterMessage extends RecyclerView.Adapter<AdapterMessage.ViewHold
         level = prefs.getInt("log_level", Log.getDefaultLogLevel());
 
         this.canDarken = WebViewEx.isFeatureSupported(context, WebViewFeature.ALGORITHMIC_DARKENING);
-        this.fake_dark = prefs.getBoolean("fake_dark", false);
+        this.fake_dark = prefs.getBoolean("fake_dark", true);
         this.webview_legacy = prefs.getBoolean("webview_legacy", false);
         this.show_recent = prefs.getBoolean("show_recent", false);
 

app/src/main/java/eu/faircode/email/FragmentOptions.java

@@ -153,7 +153,8 @@ public class FragmentOptions extends FragmentBase {
             "language_detection",
             "quick_filter", "quick_scroll",
             "experiments", "debug", "log_level", "test1", "test2", "test3", "test4", "test5",
-            "webview_legacy", "browser_zoom", "show_recent",
+            "webview_legacy", "browser_zoom", "fake_dark",
+            "show_recent",
             "biometrics",
             "default_light"
     };

app/src/main/java/eu/faircode/email/FragmentOptionsMisc.java

@@ -1783,7 +1783,7 @@ public class FragmentOptionsMisc extends FragmentBase implements SharedPreferenc
         swUndoManager.setChecked(prefs.getBoolean("undo_manager", false));
         swWebViewLegacy.setChecked(prefs.getBoolean("webview_legacy", false));
         swBrowserZoom.setChecked(prefs.getBoolean("browser_zoom", false));
-        swFakeDark.setChecked(prefs.getBoolean("fake_dark", false));
+        swFakeDark.setChecked(prefs.getBoolean("fake_dark", true));
         swShowRecent.setChecked(prefs.getBoolean("show_recent", false));
         swModSeq.setChecked(prefs.getBoolean("use_modseq", true));
         swUid.setChecked(prefs.getBoolean("uid_command", false));

app/src/main/java/eu/faircode/email/WebViewEx.java

@@ -387,11 +387,12 @@ public class WebViewEx extends WebView implements DownloadListener, View.OnLongC
 
     public static boolean isFeatureSupported(Context context, String feature) {
         if (WebViewFeature.ALGORITHMIC_DARKENING.equals(feature)) {
-            SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(context);
-            boolean fake_dark = prefs.getBoolean("fake_dark", false);
-            if (fake_dark)
-                return false;
-
+            if (BuildConfig.DEBUG) {
+                SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(context);
+                boolean fake_dark = prefs.getBoolean("fake_dark", true);
+                if (fake_dark)
+                    return false;
+            }
             if (Build.VERSION.SDK_INT < Build.VERSION_CODES.Q)
                 return false;